Community-weighted trait means of diatom species found in cluster 1/1′ and 2/2′. The color bar indicates the value of the normalized community-weighted trait means (0 to 1) for clusters 1/1′ (framed in blue) and 2/2′ (framed in red). The eight traits include equivalent spherical diameter (ESD), surface area to volume ratio (S/V), optimum temperature for growth (Topt), ability to produce ice-binding proteins (IBP), presence or absence of long, sharp projections such as setae, spines, horns and cellular processes (‘spikes’), degree of silicification (‘silicified’) qualitatively based on examination of SEM images, propensity to form resting spores (‘spores’), and ability to form colonies (‘colonies’). Each trait was normalized in relation to the stations that presented the lowest (= 0) and the highest values (= 1). DOI: https://doi.org/10.1525/elementa.382.f11